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virtio-pci: error out when both legacy and modern modes are disabled

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Without presuming if we got there because of a user mistake or some
more subtle bug in the tooling, it really does not make sense to
implement a non-functional device.

Signed-off-by: Greg Kurz <gkurz@linux.vnet.ibm.com>
Reviewed-by: Marcel Apfelbaum <marcel@redhat.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Greg Kurz <groug@kaod.org>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Greg Kurz 2016-09-09 11:00:59 +02:00 committed by Michael S. Tsirkin
parent 4a1e48beca
commit 3eff376977
1 changed files with 8 additions and 0 deletions
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8
hw/virtio/virtio-pci.c
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@ -1776,6 +1776,14 @@ static void virtio_pci_realize(PCIDevice *pci_dev, Error **errp)
proxy->disable_legacy = pcie_port ? ON_OFF_AUTO_ON : ON_OFF_AUTO_OFF;
}
if (!(virtio_pci_modern(proxy) || virtio_pci_legacy(proxy))) {
error_setg(errp, "device cannot work as neither modern nor legacy mode"
" is enabled");
error_append_hint(errp, "Set either disable-modern or disable-legacy"
" to off\n");
return;
}
if (pcie_port && pci_is_express(pci_dev)) {
int pos;